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Terminated microstrip antenna

  • US 4,167,010 A
  • Filed: 03/13/1978
  • Issued: 09/04/1979
  • Est. Priority Date: 03/13/1978
  • Status: Expired due to Term
First Claim
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1. Microstrip antenna apparatus comprising:

  • a circuit board of dielectric material having front and back sides with a metallic ground plane on the back side thereof;

    a radiating element in the form of a patch of metal etched on the front side of said board;

    first transmission line means connected along a center line of said radiating element to a first point at one side of the center thereof for coupling to radio equipment;

    second transmission line means connected along said center line of the radiating element to a second point at the opposite side of the center, terminated in an impedance very substantially different from the characteristic impedance so that the radiating element is tunable to resonant frequencies depending on the length of the second transmission line means and the value of said impedance, whereby the radiating element may be caused to resonate for a plurality of separate frequencies with the first transmission line means having a low standing wave ratio.

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